Here’s another source
https://www.thesun.co.uk/news/16110674/wgn-tv-anchor-allison-payne-cause-of-death/
Here’s another source
https://www.thesun.co.uk/news/16110674/wgn-tv-anchor-allison-payne-cause-of-death/
Says “Her cause of death has not been revealed”